StringHelper.cs 对html标签过滤代码,代码库,德仔网

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【】 StringHelper.cs 对html标签过滤

作者:Ingram / 发布于2016/1/8/ 779


	using System;
	using System.Collections.Generic;
	using System.Linq;
	using System.Text;
	using System.Text.RegularExpressions;
	using System.Web;

	namespace Common
	{
	 public class StringHelper
	 {
	 public static string SubStr(string sString, int nLeng)
	 {
	 if (sString.Length <= nLeng)
	 {
	 return sString;
	 }
	 else
	 {
	 return sString.Substring(0, nLeng) + "...";
	 }
	 }

	 /// <summary>
	 /// 清除脚本
	 /// </summary>
	 /// <param name="Htmlstring"></param>
	 /// <returns></returns>
	 public static string NoHTML(string Htmlstring)
	 {
	 //删除脚本
	 Htmlstring = Regex.Replace(Htmlstring, @"<script[^>]*?>.*?</script>", "", RegexOptions.IgnoreCase);
	 //删除HTML
	 Htmlstring = Regex.Replace(Htmlstring, @"<(.[^>]*)>", "", RegexOptions.IgnoreCase);
	 Htmlstring = Regex.Replace(Htmlstring, @"([/r/n])[/s]+", "", RegexOptions.IgnoreCase);
	 Htmlstring = Regex.Replace(Htmlstring, @"-->", "", RegexOptions.IgnoreCase);
	 Htmlstring = Regex.Replace(Htmlstring, @"<!--.*", "", RegexOptions.IgnoreCase);
	 Htmlstring = Regex.Replace(Htmlstring, @"&(quot|#34);", "/"", RegexOptions.IgnoreCase);
	 Htmlstring = Regex.Replace(Htmlstring, @"&(amp|#38);", "&", RegexOptions.IgnoreCase);
	 Htmlstring = Regex.Replace(Htmlstring, @"&(lt|#60);", "<", RegexOptions.IgnoreCase);
	 Htmlstring = Regex.Replace(Htmlstring, @"&(gt|#62);", ">", RegexOptions.IgnoreCase);
	 Htmlstring = Regex.Replace(Htmlstring, @"&(nbsp|#160);", " ", RegexOptions.IgnoreCase);
	 Htmlstring = Regex.Replace(Htmlstring, @"&(iexcl|#161);", "/xa1", RegexOptions.IgnoreCase);
	 Htmlstring = Regex.Replace(Htmlstring, @"&(cent|#162);", "/xa2", RegexOptions.IgnoreCase);
	 Htmlstring = Regex.Replace(Htmlstring, @"&(pound|#163);", "/xa3", RegexOptions.IgnoreCase);
	 Htmlstring = Regex.Replace(Htmlstring, @"&(copy|#169);", "/xa9", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, @"&#(/d+);", "", RegexOptions.IgnoreCase);
	 Htmlstring.Replace("<", "");
	 Htmlstring.Replace(">", "");
	 Htmlstring.Replace("/r/n", "");
	 Htmlstring = HttpContext.Current.Server.HtmlEncode(Htmlstring).Trim();
	 return Htmlstring;
	 }
	 /// <summary>
	 /// 生成指定长度的随机数字串
	 ///</summary>
	 ///<param name="length">长度</param>
	 ///<returns></returns>
	 public static string RndStr(int length)
	 {
	 Random rnd = new Random();
	 string returnstring = "";
	 int i = 1;
	 while (i <= length)
	 {
	 returnstring += rnd.Next(0, 9).ToString();
	 i++;
	 }
	 return returnstring;
	 }

	

	/// <summary>
	 /// 截取字符串，保留其HTML格式
	 /// </summary>
	 /// <param name="strText"></param>
	 /// <param name="len"></param>
	 /// <returns></returns>
	 public static string CutWithSubstring(string strText, int len)
	 {
	 if (strText.Length > len)
	 {
	 return strText.Substring(0, len) + "&hellip;";
	 }
	 else
	 {
	 return strText;
	 }
	 }

	

	public static string LoseHtml(string ContentStr)
	 {
	 string ClsTempLoseStr = "";
	 System.Text.RegularExpressions.Regex regEx = new System.Text.RegularExpressions.Regex("<///*[^<>]*>");
	 ClsTempLoseStr = regEx.Replace(ContentStr, "");
	 return ClsTempLoseStr;
	 }

	

	/// <summary>
	 /// 截取字符串去掉其HTML字符
	 /// </summary>
	 /// <param name="inputString"></param>
	 /// <param name="len"></param>
	 /// <returns></returns>
	 public static string CutWithOutHtml(string inputString, int len)
	 {
	 int tempLen = 0;
	 string tempString = "";
	 inputString = LoseHtml(inputString);
	 ASCIIEncoding ascii = new ASCIIEncoding();

	 byte[] s = ascii.GetBytes(inputString);
	 for (int i = 0; i < s.Length; i++)
	 {
	 if ((int)s[i] == 63)
	 {
	 tempLen += 2;
	 }
	 else
	 {
	 tempLen += 1;
	 }

	 try
	 {
	 tempString += inputString.Substring(i, 1);
	 }
	 catch
	 {
	 break;
	 }

	 if (tempLen > len)
	 break;
	 }
	 //如果截过则加上半个省略号
	 byte[] mybyte = System.Text.Encoding.Default.GetBytes(inputString);
	 if (mybyte.Length > len)
	 {
	 tempString = tempString.Substring(0, tempString.Length - 3 == 0 ? 1 : tempString.Length - 3) + "&hellip;";
	 }
	 return tempString;
	 }

	

	 }
	}

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